Press



M. J. POWER Oct. 25, 1932.

PRESS Filed Dec. 29, 1930 Patented Oct. 25, 1932.

UNITED STATES MICHAEL 3'. POWER, OF NE KOOS A, WISCONSIN" PRESS' Application filed December 29, 1930. Serial No. 505,258.

This invention relates to improvements in presses.

It is the primary object of the invention to provide an improved form of opening for the escape of liquid from a press. The invention is adapted to be incorporated in the walls of bark presses and presses for other purposes. As an exemplification of a machine in which a wall structure embodying this invention may be used advantageously, reference is made to the disclosure of Patent 1,602,626, granted October 12th, 1926.

Through the use of the present invention a press may be made to handle, relatively fine materials, such as paper mill screenings and the like, without clogging the openings which permit the escape of water. The particular purpose of the invention is to provide anopening which originates at a point in the interior surface of the cylinder wall, relatively advanced in the. direction of piston travel, and which is so formed adjacent its point of origin as to leave no sharp edge upon which the material may catch. Thence the opening is gradually enlarged and ex tended rearwardly in opposition to the direction of piston travel so that the friction of the advancing piston tends at all times to keep solid matter within the cylinder while the outward flow of liquids freely removes particles which enter the discharge ports and which cannot become trapped therein in view of the expanding cross section.

In the drawing:

Figure 1 is a longitudinal section through the cylinder of a press embodying this invention.

Figure 2 is an enlarged detail view in transverse section along the line indicated at 2-2 in Figure 3.

Figure 3 is a further enlarged detail showinga fragment of the cylinder wall in horizontal section.

Like parts are identified by the same reference characters throughout the several views.

The cylinder 5 has a hopper at 6 and a discharge throat at 7 through which material fed into the hopper is forced by the advance of the piston 8.

Theside walls 9 of cylinder 5 are not merely foraminous, but, in accordance with this invention are provided with openings generically designated by reference character 10. These openings are rectangular in cross section-as shown in Figure 2. They incline rearwardly with reference to the direction of advance of piston 8, as shown by the arrow in Figure 3. i 7.

Each of the ports 10 preferably has one rectilinear wallll which intersects the inner surface of the side Wall 9 of the press cylincylinder 5, its advance therein creates little or no tendency for the material to force its way outwardly through the ports 10. Any portion of the material which bulges into the openings of said ports upon passing the respective throats thereof, is readily forced back into the cylinder by the curvature of Wall 12 between points 14 and 18 and the sharply acute angular disposition of the por as a whole. Any particles which do escape from the cylinder into the ports must of necessity be carried freely therefrom without clogging, since the ports are narrowest at 14 directly opposite the apex of the angle above referred to, and their continually expanding cross section therebeyond offers no opportunity for the material to lodge.

As will be observed in Figures 1 and 3, the several ports are preferably arranged in rows and are staggered as between adjacent rows.

I claim:

1. In a press the combination with a reciprocable piston, of a cylinder member provided with escape ports having front and rear walls outwardly diverging and both rear- Wardly inclined with reference to the direction of piston advance, the rear wall being rectilinear and the front Wall being so curved that the path of the piston is substantially tangent thereto.

2. In a press a cylinder member having an inner surface across Which a piston is adapted to advance, an outer face spaced from he inner surface, and escape ports leading from the inner surface to the outer face in a rearward direction With reference to the advance of said piston, the front and rear walls of said member at each of said ports being con.-

i tinuously divergent from a point opposite the apex Where the rear Wall joins the inner surface of said member, the front Wall being curved from said point toward said inner surface and merging smoothly therewith, Whereby to tend to restore to the path of the piston solid matter pressed into the port.

3. In a press a cylinder member having an inner surface across which a piston is adapted to advance, an outer face spaced from said inner surface and escape ports leading from the inner surface to the outer face, the Walls of said member bounding said ports at the front and rear thereof being sharply inclined rearwardly with reference to the direction of piston advance, the rear Wall being substantially rectilinear to join said inner surface at a sharply acute angle and the for- Ward Wall at each port being substantially rectilinear from the outerface of said member to a point opposite said angle and being thence deflected toward the plane of the inner surface of said member.

MICHAEL J. POWER. 

